Organic light emitting element and manufacturing method thereof

Abstract

An organic light emitting element and a manufacturing method thereof are provided. The organic light emitting element includes a substrate, a first electrode, an organic light emitting layer, a first inorganic barrier layer and a second electrode. The first electrode is over the substrate. The organic light emitting layer is the first electrode. The organic light emitting layer includes an electron injection layer and an electron transport layer. The electron injection layer includes an inorganic barrier material, and the electron transport layer includes an organic barrier material. The first inorganic barrier layer is between the first electrode and the organic light emitting layer. The second electrode is over the organic light emitting layer. The electron injection layer is between the electron transport layer and the second electrode.

What is claimed is: 
     
         1 . An organic light emitting element, comprising:
 a substrate;   a first electrode over the substrate;   an organic light emitting layer over the first electrode, wherein the organic light emitting layer comprises an electron injection layer and an electron transport layer, the electron injection layer comprises an inorganic barrier material, and the electron transport layer comprises an organic barrier material;   a first inorganic barrier layer between the first electrode and the organic light emitting layer; and   a second electrode over the organic light emitting layer, wherein the electron injection layer is disposed between the electron transport layer and the second electrode.   
     
     
         2 . The organic light emitting element according to  claim 1 , wherein the organic light emitting layer further comprises a plurality of organic material layers, the electron transport layer is in partial contact with the second electrode, and the plurality of organic material layers are spaced apart from the second electrode by the electron transport layer. 
     
     
         3 . The organic light emitting element according to  claim 1 , wherein the organic light emitting layer further comprises an organic emission layer and a hole barrier layer, the hole barrier layer comprises the organic barrier material and is disposed between the organic emission layer and the electron transport layer. 
     
     
         4 . The organic light emitting element according to  claim 3 , wherein the hole barrier layer contacts the electron transport layer, and the organic emission layer is spaced apart from the second electrode by the hole barrier layer and the electron transport layer. 
     
     
         5 . The organic light emitting element according to  claim 1 , wherein the first inorganic barrier layer covers an upper surface and a side surface of the first electrode. 
     
     
         6 . The organic light emitting element according to  claim 1 , wherein the first inorganic barrier layer comprises a transition metal oxide, and the organic barrier material comprises a combination of lithium quinolate and a phenanthroline compound. 
     
     
         7 . The organic light emitting element according to  claim 1 , wherein the electron injection layer comprises a lanthanide element. 
     
     
         8 . The organic light emitting element according to  claim 1 , further comprising:
 a second inorganic barrier layer covering the second electrode; and   a capping layer over the second inorganic barrier layer and spaced apart from the second electrode by the second inorganic barrier layer.   
     
     
         9 . The organic light emitting element according to  claim 8 , wherein a thickness of the first inorganic barrier layer and a thickness of the second inorganic barrier layer are both equal to or less than 50 angstrom (A). 
     
     
         10 . The organic light emitting element according to  claim 1 , wherein a region in which the first electrode, the organic light emitting layer, and the second electrode overlap in a light emitting direction is defined as a light emitting region, and a ratio of an area of the light emitting region to a perimeter of an outline of the light emitting region is equal to or greater than 325. 
     
     
         11 . A manufacturing method of an organic light emitting element, comprising:
 providing a substrate;   disposing a first electrode over the substrate;   forming a first inorganic barrier layer over the first electrode;   forming a plurality of organic material layers over the first inorganic barrier layer;   forming an electron transport layer over the plurality of organic material layers, comprising co-evaporating lithium quinolate and a phenanthroline compound on the plurality of organic material layers; and   disposing a second electrode over the electron transport layer.   
     
     
         12 . The manufacturing method according to  claim 11 , further comprising:
 forming a hole barrier layer over the plurality of organic material layers before forming the electron transport layer, wherein the electron transport layer is formed over the hole barrier layer.   
     
     
         13 . The manufacturing method according to  claim 11 , wherein forming the first inorganic barrier layer comprises:
 depositing or coating a transition metal oxide on the first electrode.   
     
     
         14 . The manufacturing method according to  claim 11 , further comprising:
 forming an electron injection layer over the electron transport layer, comprising depositing a lanthanide element on the electron transport layer.   
     
     
         15 . The manufacturing method according to  claim 11 , further comprising:
 forming a second inorganic barrier layer covering the second electrode; and   forming a capping layer over the second inorganic barrier layer, wherein the capping layer is spaced apart from the second electrode by the second inorganic barrier layer.   
     
     
         16 . The manufacturing method according to  claim 15 , wherein forming the second inorganic barrier layer comprises:
 depositing or coating a transition metal oxide on the second electrode.